Subvalent Compounds Featuring Direct Metal-Metal Bonds: The ZnZn Bond in [Cp2Zn2]

Something to zinc about: Subvalent compounds with direct metal–metal bonds have been the focus of interest for many decades. Recently the first synthesis of a molecular compound with a direct ZnZn bond was reported. The synthetic route, although not understood, might lead the way to other interesting compounds featuring direct metal–metal bonds, for example, of Group 2 elements.